[jira] Closed: (LANG-646) StringEscapeUtils.unescapeJava doesn't handle octal escapes and Unicode with extra u

["Henri Yandell (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LANG-646?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Henri Yandell closed LANG-646.
------------------------------

    Resolution: Fixed

svn ci -m "Adding an OctalUnescaper to handle Java's support of 1->377 Octal values. LANG-646"
Sending        src/main/java/org/apache/commons/lang3/StringEscapeUtils.java
Adding         src/main/java/org/apache/commons/lang3/text/translate/OctalUnescaper.java
Adding         src/test/java/org/apache/commons/lang3/text/translate/OctalUnescaperTest.java
Transmitting file data ...
Committed revision 1059753.

I didn't see much point in an OctalEscaper, so I didn't bother adding that. When escaping Java, we wouldn't know to escape a particular character to Octal for the aesthetic value.

It also only supports Java's 1->377 octal range; this is because Integer.parseInt(..., 8) only supports that. I didn't see any point in trying to do better than that given that the use case is primarily for Java at the moment.

> StringEscapeUtils.unescapeJava doesn't handle octal escapes and Unicode with extra u
> ------------------------------------------------------------------------------------
>
>                 Key: LANG-646
>                 URL: https://issues.apache.org/jira/browse/LANG-646
>             Project: Commons Lang
>          Issue Type: Bug
>          Components: lang.*
>    Affects Versions: 2.5
>         Environment: Irrelevant
>            Reporter: polygenelubricants
>            Priority: Minor
>             Fix For: 3.0
>
>
> CODE TO REPRODUCE BUG:
> {noformat}
> System.out.println("\45");
> // %
> System.out.println(StringEscapeUtils.unescapeJava("\\45"));
> // 45, should be %
> System.out.println("\uu0030");
> // 0
> System.out.println(StringEscapeUtils.unescapeJava("\\uu0030"));
> // throws NestableRuntimeException:
> {noformat}
> This is not compliant with the JLS, which allows both [OctalEscape] and extraneous u for [UnicodeMarker] in Java string literal.
> REFERENCES:
> 3.10.6 Escape Sequences for Character and String Literals
> http://java.sun.com/docs/books/jls/third_edition/html/lexical.html#3.10.6
> 3.3 Unicode Escapes
> http://java.sun.com/docs/books/jls/third_edition/html/lexical.html#3.3
> EXTERNAL LINKS:
> http://stackoverflow.com/questions/3537706/howto-unescape-a-java-string-literal-in-java/

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